Typewriting-machine



0. PETERMANN.

TYPEWRITING MACHINE.

APPLICATION FILED'JUNE 5' 1917- Patented Oct. 26,1920. I

3 SHEETS-SHEET 3.

0. PETERMANN.

TYPEWRITING MACHINE.

APPLICATION FILED JUNE 5, 1911.

Patented Oct. 26, 1920..

3 SHEETSSHEET 2.

A TTOR/VE Y J O. PETERMANN.

TYPEWRITING MACHINE.

APPLICATION FILED JUNE 5. 1917.

1,356,82 Patented Oct. 26,1920..-

3 SHEETS-SHEET I.

INVENTOR A TTOR/VEVS UNITED PATENT ,FF cE- OTTO PETERMANN, or (moron, NEW YORK, ASSIGNOR T0 CORONA 'IIYPEWRITER COMPANY, me, or (moron, NEW YORK, A'CORPORATION' on NEW YORK.

TYPEWRITING-MACHINE.

Specification of Letters Patent. Patentgd 02 1; 26 192() Application filed June 5, 1917. Serial No. 172,854.

T 0 at whom it may concern:

Be it known that I, OTT 0 PETERMANN, a citizen of the United States, and resident of Groton county of Tompkins, and State of New York, have invented certain new and useful Improvements *in Typewriting- Machines, of which the following is a specification,

This, invention relates. more particularly to key actions of front-strike, visible typewriting machines.

One of the principal objects of the invention is to provide a key action which has a very easy and uniform touch and in which the type bars have an upward and rearward accelerated movement.

Another object of the invention is to so construct the key action that it will form an eflicient rebound lockto effectively hold the type bar against any reboundingmotion after the bar has returned to its point of rest. By providing an efiective rebound look any form of noiseless cushioning material may be used as a stop to receive the blow or impact of the type bar on its return from its printing movement.

In typewriting machines which are not provided with a rebound lock the type bars.

frequently so move in rebounding from the type rest that when adjacenttype bars are actuated in succession they are liable to 'interlock.

Another object of the inventionis to provide simple means'for adjusting the variportable typewriting machines.

In the drawings, Figure 1 is a side elevation of a key action, the supporting parts and the platen being shown in sectional view; I

Fig. 2 a similar view showing the type bar in its printing position against the platen;

fulcrum prongs in section an Fig. 3 a view similar to Fig. 1, showing a slightly modified form of bell-crank lever interposed'between the key lever and the type bar;

"F ig. 4 a detail sectional View showing the manner of mounting the bell-crank lever in its supporting bar;

Fig. 5 a detail plan view of the modified form of bell-crank lever shown in Fig. 3;

Fig. 6 a detail view of a portion of the key lever;

Fig. 7 a diagrammatic View illustrating the acceleration of the type bar;

Fig. 8 a.detail side View of a portion of the bearing segment, showin one of the showing a slightly varied form of bell-crank lever;

Fig. 9 a bottom plan view of the bellcrank lever shown in Fig. 8;

Fig. 10a detail View showing the manbe supported on any suitable form of carriage; 2 the type bar segment which forms 'the support for the type bars, said support being of any suitable form or construction, and 3 the type rest, "said rest being provided with a suitable soft cushioning material. The type bar 5 is mounted at its rear end upon a pivot 6, and carriesat its forward end a type head 7, which, as shown in. the drawing, is provided with three printing characters. Below the type bar, near its rear end is suitably supported the key lever fulcrum bar 8, said bar being preferably located close to the lower edge of the type bar in order that the key action will occupy a small space and be adapted for use in small portable type- W-riting. machines. The key lever 9 is notched on its under side at its rearend, as at 10, to receive the'edge of the fulcrum bar, as shown clearly in Fig. 1. The fulcrum bar is perforated to admit of the passage of the rear end of the key lever.

The forward end of the key lever extends upwardly and is provided with the usual said lever in its normal or'at-rest position.

The upper end of the vertical portion 12 of the key lever is bent laterally to form a stop lug 12*, said lug being adapted to be bent vertically in order to adjust the at-rest position of the key lever. Extending rearwar'dly from the part, 12 is a bendable, substantially horizontal adjusting prong 14. To the forward end of this prong is pivoted an upwardly extending link 15.- V Y A bell-crank lever 19 is pivoted on an upwardly extending fulcrum prong 17 formed integral with a sheet metal segment 18. The fulcrum prong is in the form of a twisted tooth integral with a flange on the sheet metal segment. The bell-crank'lever 19 is formed -with an upwardly and forwardly extending arm 19 and with a rearwardly extending arm 19 The arm 19 is greater in length than the arm 19 and said arm 19 extends rearwardly in a substantially horizontal line. 1

It will be observed that the fulcrum-support 18 is in the form of a sheet-metal bar of channel form, the two longitudinal edgebar.

flanges extending upwardly, one of' them being deeper than the other in order to afford sufiicient metal to form the upstanding ears 17, these ears being formed by vertically slitting the flange at intervals and twisting the lugs thus formed so that they will lie at an angle with reference to the supporting- This results in astiff and light ful- '.crum-bar which can be.:manufactured ata minimum cost and which will have the minimum weight.

The rear end of the type bar is formed with a short downwardly extending arm 23, v

and said arm is connected to the arm 19 of the lever 19 by a horizontal link 24. The polnts of connection between the arm 23,

. link 24 and arm 19 of the bell-crank lever,

' are in a direct line with the center of the pivot 22 of said lever when the parts are in their normal at-rest position, as shown clearly in Fig. 1. When the parts are in the position just described the type bar can not be moved upwardly except through a downward moveme nt of the key lever. Any tendency of the type head to move upwardly is prevented by the arm 23, link 24 and lever'arm 19 because the forward thrust of the arm 23 will be transmitted directly to the center of the pivot 22 of, the lever 19 and there will be-no upward movement of the type bar. These parts are on centers and are locked against movement through the type bar. It is manifest that this will effectually prevent any re,- bound of the type bar after it has moved back to its at-rest position. Connected to the bell-crank lever and the key lever fulcrum bar is a spring 25 which returns all the parts to their normal at-rest positions upon the release of the key lever. 26 indicates a universal bar of any suitable construction and which is adapted to be engaged by the key lever as it is depressed.

The upwardly extending fulcrum prong 17 supportingthe lever 19, may be readily bent forward or rearward by any suitable device, in order to properly adjust the connection between the rearwardly extending arm 19 of the lever 19 and'the forward end of the link 24. 'Byproviding this bendable fulcrum prong propenadjustment may be made between the lever 19 and arm 23 of the type bar without thenecessity of using any other form of adjusting device, such, for instance, as the ordinary and well-known turn buckle. In order to secure the proper adjustment between the key lever, the link 15 and'the arm 19 of the bell-crank lever, the prong 14 of the key lever is bendable vertically. It is, therefore, to be noted that all of the necessary adjustments between the several parts of the key action may be secured by bending suitably arranged lugs or prongs, thereby avoiding the use of screws or other similar devices which are liable to be jarred out of proper adjustment in the use of the machine. This method of adjusting is especially advantageous in securing the proper positions of theparts to lock ,the type bar against rebound.

n Fig. 2 the key action is shown as having been operated to throw the type head on the type bar to the, printing point on the platen. It is manifest, therefore, that as the key lever is depressed the motiontransmitted to the type bar will be greatly accelerated toward the completion of the printing movement. It is also manifest that at the start of the key lever movement the type bar movement will be slow but will respond to a very li ht touch.rBy reason of the disposition of, the ink 24 and arm 19 of the bell-crank lever 19 there must be a slight movement of the lever 19 before there can be any upward and forward movement of the link 24. This bar will be due to the upward and forward movement of the arm 19 of the said lever. By reason of this construction and arrangement of the parts the key stroke may be made reasonably'short.

In the drawings the movements of the type bar, the bell-crank lever and the key lever, are indicated by numerals and dotted lines. The'downward movement of the key lever is-indicated by thenumerals 0, 1, 2, 3 and 4, the horizontal lines adjoining said numerals indicating equal parts of the downward travel of the said lever. The upward movement of the type bar is indicated by the numerals 0, 1,2, 3 and 4, the spaces between said numerals indicating the distances traveled by the type bar during the movement of the key lever through the spaces between corresponding numerals. In Fig. 7 the acceleration of the type bar movement by reason of the peculiar arrangement of the bellcrank lever, is diagrammatically illustrated.

. The movement of the bell-crank lever is divided into four parts to correspond to the divisions of the movements of the key lever and the type bar. The corresponding positions of the short arm 23 of the type bar are also indicated in this figure. readily seen that the type bar will receive a very slight movement during the first quarter of the upward movement of the arm 19 of the bell-crank lever. It will also be observed that the upward movement of the arm 23 of the type bar is gradually increased during the successive quarters of the movement of the said arm 19", the greatest travel being during the last quarter of said movement. It is manifest, therefore, that the upward movement of the type bar corresponding to the downward movement of the key between the numerals 0 and 1, is very much lessthan the upward movement of the type bar corresponding to the downward movement of the-key between the numerals 1 and 2; and that the greatest movement of the type, bar results from the downward movement of the key between the numerals 3 and 4.

It is manifest that the locking action between the type bar, link 24 and bell-crank lever 19, may be secured by arranging the point of connection between the link 24 and the arm 19 slightly below a direct line drawn between the center of the pivot 22 of the bell-crank lever and the point of connection between the rod 24 and the arm 23 of the type bar. This arrangement of. the

,parts, while effective, will require a slightly greater lost motion in the bell-crank lever before the movement thereof will actuate the type bar. While the parts in this positionwill be slightly off centers, it will, of

course, be understood that the same result of locking the type bar against rebounding will be secured.

It will be InFig. 3 a slightly different form of bellcrank lever is interposed between the vertical link 15 and the horizontal link 24. As shown in this figure andin Fig. 4, the bellcrank lever 27 is formed with an archshaped bearing lug 28 which is formed integral with the body of the lever at the pivot- 211 point thereof so that the said lever has two points of support and bearing on the pivot rod, as shown clearly in Fig. 4. The fulcrum segment 29 is'provided with upwardly extending bearing lugs 30 between Fig. 1. 11 Figs. 8, 9 and 10, the bell-crank lever is provlded with a rigid pivot 32, which is adapted to fit a corresponding aperture in the fulcrum prongs. Each bell-crank lever 15 provlded witha rigid pivot so that each may be independently assembled and adjusted. The arch-shaped bearing lug is adapted to be bent close to the side of the fulcrum prong, as'shown in Fig. 8, to maintain the bell-crank lever in place. The free arm of the arch-shaped bearing lug extends outwardly away from the pivot, as shown in Fig. 10, to facilitate the assembling of the parts. When the ivot is in place in the fulcrum prong, the rec arm or member of the arch-shaped bearing lug is bent inwardly to the side of the fulcrum prong, as shown in Fig. 8. An one of the bell-crank levers may be rea il detached from its fulcrum prong by ben ing outwardly the free arm of the arch-shaped lug. This permits the parts to be readily assembled and also readily detached from the bearing segment. The pivot 32 is sufficiently long to extend through the fulcrum prong and into an aperture 33, formed in the free arm of the arched bearing lug so that each bell-crank lever will have two points of connection to the pivot in its assembled operative position, one at each side of the bearing prong.

What I claim is:

1.,In a ke action the combination of a type bar, a liey lever formed with a vertically extending part near its forward end, a laterally bentvertically adjustable lug on said vertical part adapted to engage a key lever stop, a rearwardly extendlng bendable prong formed on said vertical extending part, a bell-crank lever, a link connected to the bendable prong on the key lever and to one arm of the bel1-cranklever,'and a link connecting the other arm of the bell-crank lever to the type bar.

2. In a key action, the combination of a type bar, a keylever having an integral upwardly extending and laterally bendable stop lug, a ke lever stop adapted to be engaged by the ent upper end of said stop, a bendable finger formed on saidkey lever, a bell-crank lever.fulcrumed above the key lever, a vertical link connecting one arm of said bell-crank lever with the free end of said bendable finger, and a.link .connecting the other arm of said bell-crank lever with the type bar. l

3. In a key action, the combination 'of a pivoted type bar, ake lever pivoted at its rear end, a bell-crank lever, an adjustable pivotal support for the bell-crank" lever, an

'fourth' day of May adjustable connection between the key lever.

ofsaid bell-crank lever, a fixed stop above the key lever, an adjustable stop carried by the key lever adapted to engage said fixed stop to-limitthe upward movement of the free end of the key lever, and a spring for normallyholding said adjustable and fixed key lever stops in'en agement with each other and for norma 1y maintaining the point of connection between the link and bell-crank lever on a line with the pivotal point of the bell-crank lever and the point 'of connection between the link and type bar.

This specification signed this twenty- A. D. 1917. I 'IlTO PETERMANN. 

